Saul,
> Le 1 févr. 2023 à 04:16, Saul Tobin <saul.james.to...@gmail.com> a écrit : > > The fourth example engraver here: > https://extending-lilypond.readthedocs.io/en/latest/extending/translation.html#fourth-engraver-example > > Running this code in 2.24 crashes on initializing the engraver with In > procedure ly:spanner-set-bound!: Wrong type argument in position 3 > (expecting Item): (). Thanks for the report. I suppose you did not realize that this “Extending LilyPond” resource is not part of the official documentation, it’s something I wrote up and maintain externally (unlike the official Extending Manual, which lives at https://lilypond.org/doc/v2.24/Documentation/extending/index.html). Thus, any feedback you have should be sent to me privately, not to the bug list. Best, Jean